Abstract We use the satellite precise clock offset product of IGS BDS-3 in 2021(GPS week 2 138 to 2 190) to analyze the periodic change and construct a high-precision model function based on the periodic results. The results show that the modeling accuracy of the additional eight periods reaches 0.049 ns, increasing accuracy by about 70% compared with the quadratic polynomial results. Meanwhile, the performance of precise point positioning(PPP) is analyzed based on the modeling results of BDS-3 satellite clock offset. Although the PPP convergence time of the modeling BDS-3 satellite clock offset product is slightly slower than that of the IGS final products, it can achieve centimeter-level positioning. Moreover, the modeling products can greatly save memory space compared with the current IGS discretization products.